#include "exp.h"
#include "regex_yaml.h"
#include "regeximpl.h"
#include "stream.h"
#include "yaml-cpp/exceptions.h" // IWYU pragma: keep
#include "yaml-cpp/mark.h"

namespace YAML {
const std::string ScanVerbatimTag(Stream& INPUT) {
    std::string tag;

    // eat the start character
    INPUT.get();

    while (INPUT) {
        if (INPUT.peek() == Keys::VerbatimTagEnd) {
            // eat the end character
            INPUT.get();
            return tag;
        }

        int n = Exp::URI().Match(INPUT);
        if (n <= 0)
            break;

        tag += INPUT.get(n);
    }

    throw ParserException(INPUT.mark(), ErrorMsg::END_OF_VERBATIM_TAG);
}

const std::string ScanTagHandle(Stream& INPUT, bool& canBeHandle) {
    std::string tag;
    canBeHandle = true;
    Mark firstNonWordChar;

    while (INPUT) {
        if (INPUT.peek() == Keys::Tag) {
            if (!canBeHandle)
                throw ParserException(firstNonWordChar,
                                      ErrorMsg::CHAR_IN_TAG_HANDLE);
            break;
        }

        int n = 0;
        if (canBeHandle) {
            n = Exp::Word().Match(INPUT);
            if (n <= 0) {
                canBeHandle = false;
                firstNonWordChar = INPUT.mark();
            }
        }

        if (!canBeHandle)
            n = Exp::Tag().Match(INPUT);

        if (n <= 0)
            break;

        tag += INPUT.get(n);
    }

    return tag;
}

const std::string ScanTagSuffix(Stream& INPUT) {
    std::string tag;

    while (INPUT) {
        int n = Exp::Tag().Match(INPUT);
        if (n <= 0)
            break;

        tag += INPUT.get(n);
    }

    if (tag.empty())
        throw ParserException(INPUT.mark(), ErrorMsg::TAG_WITH_NO_SUFFIX);

    return tag;
}
} // namespace YAML
